形容词
中文翻译：深的
同义词：
['substantial', 'profound', 'substantial']
例句：
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1. The book is deep into the history of the country.
这本书深入探讨了该国的历史。
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2. The conversation was deep and meaningful.
对话深刻且富有意义。
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3. The scientist's research is deeply rooted in his field of expertise.
这位科学家的研究深深植根于他的专业领域。